Check_MK Werk 4691: Make Smart Ping more robust

ID: 4691 Title: Make Smart Ping more robust Component: Core & setup Level: 1 Class: Bug fix Version: 1.5.0i1 In some environments, Smart Ping can be confronted with esoteric link-layer header types and non-IPv4 packets. This could lead to incorrectly reported Smart Pings, which are normally harmless, but confusing in the presence of logging. This has been fixed.